Reload should update preview window

Fix #2644

src/terminal.go

@@ -2673,6 +2673,7 @@ func (t *Terminal) Loop() {
 					command := t.replacePlaceholder(a.a, false, string(t.input), list)
 					newCommand = &command
 					t.reading = true
+					t.version++
 				}
 			case actUnbind:
 				keys := parseKeyChords(a.a, "PANIC")

test/test_go.rb

@@ -2069,6 +2069,13 @@ class TestGoFZF < TestBase
     tmux.send_keys :Up
     tmux.until { |lines| assert_includes lines[1], '[[99]]' }
   end
+
+  def test_reload_should_update_preview
+    tmux.send_keys "seq 3 | #{FZF} --bind 'ctrl-t:reload:echo 4' --preview 'echo {}' --preview-window 'nohidden'", :Enter
+    tmux.until { |lines| assert_includes lines[1], '1' }
+    tmux.send_keys 'C-t'
+    tmux.until { |lines| assert_includes lines[1], '4' }
+  end
 end
 
 module TestShell